There are lots of puzzles where you need to use cubes to redirect lasers. How about switching it around for a while and use lasers to redirect cubes instead? A custom gameplay mechanism called the "sendificator" does exactly that.
In this series of maps

Best SinglePlayer Maps

Collection by Ace Pyder

I know it's a lot but these are all, in my opinion, great quality single player maps.

New Concepts

Collection by cyron43

New game concepts like gravity vectoring, non-euklidian design and the like.

Portaal

Collection by GodFather

awesome maps

Collection by DragonHawx

cool difficult maps and/or maps i loved to figure out

Tatsuto's Testing Sequence

Collection by Nappy-Tuna Ikazuchi

Stuff I look forward to play.

Prettiest Maps I've Found

Collection by KennKong

Sometimes you just want to stop and smell the flowers.

KennKong's Favorite Puzzle Maps

Collection by KennKong

These are the maps I've found that made me think the most. Some of them may be very hard to figure, but none require ninja skills.
Don't to forget to rate these and visit the workshops of the original authors.

Innovative Maps

Collection by KennKong

These are maps I've found which introduce new mechanics or other ideas not found in the original game, While some are just proofs of concept, most are excellent maps to play notwithstanding the innovations.
Feel free to suggest other maps like this, an

swag

Collection by Gareth48

swag

puzzle extreme hard

Collection by feroid

puzzle list that I like for some of this reason:
Hard Difficulty, Funny Map , Unusual test...
most of it for hard difficulty reason ;)
I' warning you.. not for lazy or unpatient players.. ;)
warm your brane and have fun...
I' will actualize collect